Gear Level Frame-By-Frame Guide

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For future reference, based on the appearance of the enemy in higher level LS/DS/cantina nodes, gear 12 will have the same framing as gear 11, but colored gold instead of purple. Probably subject to change, however.

The colors follow an RPG's order of colors regarding the value of the loot taken in some missions. Seems to be firstly seen in Diablo and reproduced in many other RPG or MMO games. It is probably depicted as:
White - known as "common".
Green/Blue/Purple - following the color spectre.
Orange - associated to "Gold", which represents the rarest kind of loot.
The aspects of the gear frames are still a mistery for me, though.

The specific markings are not part of any established archetype that makes them easy to identify, however it does trigger some archaic notion in our minds that the more detailed something is the better it is.